My son, who is a senior in high school, asked me if we could go backpacking this summer as a "last hoorah" before college. While he was in scouts we backpacked around Missouri and Arkansas but he is looking for a bigger adventure. His request is a "pine forest". My request is within a days drive of Kansas City, 16ish hrs. I would prefer something with access to filterable water so we don't have to carry a lot with us. We are looking for about a 4 day trek. He would prefer not to go to Colorado since I have spent time there hunting. He wants to go to a place neither of us have been. What do y'all suggest?